paypal express button loop

This is not something we’ve seen ourselves, and we don’t have any other reports of it, so there must be something unique going on with your particular site configuration.

Is this happening from all the different places the PayPal button gets displayed (ie. product page, cart page, checkout page) or is it only happening in one particular place? Do you have In-Context enabled?

Also, can you try temporarily disabling other plugins and switching to a different theme to see if the issue goes away? If so, then you could re-enable each thing until the problem comes back to find the culprit. If you can find the culprit we can see about reproducing the problem and getting it fixed.